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位场分离方法在重、磁数据处理和解释中发挥着重要作用,本文重点研究了空间域中常用的平均场值法、向上延拓法、圆周法、趋势分析法等四种方法的基本原理,通过模型试验对比分析了不同方法的场分离效果,并将四种方法应用到了相山布格重力异常的分离之中.模型试验及实例应用表明,平均场值法和圆周法的场分离效果较为理想,但圆周法分离出的区域场存在局部波动现象;向上延拓法难以将区域异常和局部异常彻底分离;趋势分析法分离出的局部场中含有明显的虚假异常.因此,就这四种场分离方法而言,选择平均场值法具有更好的实际应用价值.
The field separation method plays an important role in the processing and interpretation of heavy and magnetic data. This paper focuses on the basic principles of four methods commonly used in the space domain, such as average field method, upward continuation method, circle method and trend analysis method , The field separation effects of different methods are compared and analyzed through model tests and the four methods are applied to the separation of gravity anomalies in Xiangshanbuge.The model tests and practical examples show that the average field method and the field separation method It is difficult to separate the regional anomalies and local anomalies completely from the upward continuation method.The local fields separated by the trend analysis method contain obvious false anomalies.Therefore, In terms of field separation methods, the selection of average field method has better practical value.